I own a 2002 zx5 malibu blue focus and i am looking to convert the rear lights.Well the mod i'm trying to do is to convert the backup light into a turnsignal by rewiring the backup light and changing to an amber bulb.Any ideas?

If you're turning the backup light (reverser?) into a turn signal what will you use for letting others know you're reversing? Assuming you have a turn signal already in the light housing, by splicing into the wires of that turn signal at the rear then perhaps you could run some extra wires down to the bumper and connect the reverser too, you'd then just need an amber bulb in the clear lens. But you'd have to lower the resitance (correct me if I'm wrong) so that you wouldn't instantly lose half the power of your bulbs. Never heard of this mod before, just have a look around the light cluster is all I can offer. I have heard of something similar, that is re-wiring the rear fog-light into a reverser (Australia... fog... not a chance... at least not in Sydney and I'll never need it more than once or twice EVER) so that I have a reverser on each side. But that seems a little more simple than tapping into the indicators...

I know that the American Foci rear light assemblies are different to ours. From what i can work out:

The rear tail light assembly has three bulbs in it. The bottom one is white, used for reversing. The red top section of the tail light has two bulbs, and is the combined flasher/brake light. When the car is braking and indicating, one light is steady red and the other is flashing to indicate.

I think lime4250 wants to convert one of the two bulbs in the red section to amber, and re-wire it to work as a flasher only. My only concerns would be that the red lense would make the amber bulb still look red, and therefore the car would just look like it is braking, and not indicating also.